400 in Words
How do you write 400 in words?
The number 400 is written four hundred in words. As an ordinal it is four hundredth, and on a check you would write Four hundred and 00/100.
Last updated 19 June 2026
Other ways to write it
| Cardinal | four hundred |
|---|---|
| Ordinal | four hundredth |
| Currency | four hundred dollars |
| Check format | Four hundred and 00/100 |
How number-to-words spelling works
A cardinal number names a quantity (four hundred), while an ordinal names a position (four hundredth). English hyphenates compound numbers from twenty-one to ninety-nine and groups digits into thousands, millions, and billions.
For house-style rules on spelling out numbers, see the Chicago Manual of Style, or read our guide to spelling numbers in words.
Facts about 400
- 400 is an even number.
- It is not a prime number.
- Digit sum: 4.
- Roman numerals: CD.
- Binary: 110010000.
- Hexadecimal: 190.
| Digit | Place |
|---|---|
| 4 | hundreds |
| 0 | tens |
| 0 | ones |
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Frequently asked questions
How do you write 400 in words?
400 in words is "four hundred".
How do you spell 400?
400 is spelled "four hundred".
How do you write 400 on a check?
On a check, write "Four hundred and 00/100".